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DTMF tones
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DTMF tones
The numeric keys of the phone (0 to 9,* and #) always trans-
mit DTMF tones (Dual Tone MultiFrequency) also known as
“ touch tones ”. DTMF tones are used by certain telephone
services such as answering machines, pagers,etc.
Rather than keying in a separate code after each of a series
of requests,you can carry out complex operations in one go.
e.g.To reach ‘Listen to new messages’ in
one go
An answering machine has the following characteristics:
phone number 12345, password 9876, code 3 to
activate the function ‘Listen to new messages’.
■ Enter 12345, 12345 is displayed.
■ Press and hold to enter a wait character.
12345w is displayed.
■ Enter 9876, 12345w9876 is displayed.
■ Press and hold to enter a pause character,
12345w9876p is displayed.
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